The Piggyback Slider configuration is two Sliders:
|•||Slider[A] : moves along the X-axis† of the Mechanism-Plane|
|•||Slider[B] : mounted to Slider[A], and moves along the Y-axis† of the Slider[A]|
The Piggyback Slider Configuration is only one way to model an XY-Path.
You can also use a Motion-Path. See: Motion-Path and Blend-Curves.
† The Sliders do not need to be in the X-axis and Y-axis directions or even it right-angles to each other. We describe them in these directions for convenience only.
For example, they may be in the Radial and Tangential direction relative to a radius line of a circle.
Mechanical Systems that follow the 'XY'-Path:
Linear-Slides (Slide-ways + Slide-blocks)
|o||The Piggyback Sliders are modelled in the same way as the Linear-Motion Technology' [the motors and the mechanics].|
|o||The motors that drive the 'Sliders' have the same nominal* motion as the Piggyback Sliders. See Step 11.1|
* For example, a motor may rotate a Pulley to move a Belt, or a Ball-Screw to move a Nut. In each case, the motors rotate a different number of rotations, but their rotation is a linear relationship to the Slider's motion.
Linear Slides with Dyads
|a.||Use linear-slides to design an XY-table. |
|b.||Connect between the slide-blocks and the machine-frame. |
|c.||Use cams or servomotors on the Machine Frame to drive the Dyads and thus the XY-table|
Design and add motions to the XY-table directly. MechDesigner will use inverse-kinematics to calculate the motions for the cam-followers or servomotors - See Step 11.2
Translating Beam [a Part that moves on the Mechanism-Plane but does not rotate]
|o||It is possible to configure a translating-beam that does not need linear-slides.|
|o||Look at this video. This example happens to show 3 independent axes to control the motion of a Beam. In this case the motion of the beam can be specified to translate or rotate.|
|o||Use Piggyback Sliders to specify the XY-Path, even though they are not in the mechanical system. See Step 11.3.|
Rectilinear Translation: All points in a Part have the same and parallel motions.
Curvilinear Translation: All points in a Part have the same, but not necessarily straight, motions.